JP5859285B2 - Fire alarm system and fire detector used for it - Google Patents

Description

The present invention relates to a fire detector and a fire alarm facility.

For example, in a conventional fire alarm system, a fire receiver is installed in the central monitoring room, a line line and a common line are provided from the fire receiver, and the line line and the common line are connected via a terminating resistor. (For example, refer to Patent Document 1).

JP-A-6-176289

According to the technique described in Patent Document 1, when a failure occurs in a fire detector, a fire receiver, for example, a P-type receiver, receives that fact and cannot control an alarm or a display.
In addition, by providing a self-inspection function that outputs to the fire receiver that a failure has occurred in the fire detector, to display whether the fire detector has failed or not, the fire receiver can receive a dedicated fire receiver. There was a problem that it had to be replaced with a machine (for example, R type).
The present invention has been made to solve the above-described problems, and it is possible to notify a failure occurring in a fire detector even with a fire receiver that is not a dedicated fire receiver, without replacing an existing fire receiver. It aims at providing the fire alarm equipment which makes it possible, and the fire detector used for it.

A fire alarm system according to the present invention includes a sensor line connected to a fire receiver, one or more fire detectors connected to the sensor line and outputting a fire signal to the sensor line by a switching operation, In the fire alarm facility comprising the fire detector, the fire detector includes an inspection means for detecting its own malfunction by self-inspection, and a disconnection generating means for disconnecting the sensor line in the event of a malfunction based on the result of the inspection means. The fire receiver includes a disconnection alarm issuing means for issuing a disconnection alarm when the sensor line is disconnected.
The fire detector according to the present invention is connected to a fire receiver via a sensor line, and detects a self-failure by self-inspection in a fire detector that outputs a fire signal to the sensor line by a switching operation. A check means, a determination means for outputting a disconnect signal in the case of a malfunction based on a result of the check means, and a disconnect circuit having a switch interposed in the line of the sensor line, and receiving the disconnect signal And a disconnection generating means for disconnecting the sensor line by opening a switch of the disconnection circuit.

According to the fire alarm facility according to the present invention, the disconnection generating means provided in each fire detector disconnects the sensor line when a failure of its own fire sensor is detected, and a disconnection alarm is generated. The reporting means issues a disconnection alarm when the sensor line is disconnected. Thereby, even if the fire alarm facility according to the present invention is not a dedicated fire receiver, it is possible to notify the malfunction of the fire detector with the existing fire receiver without renewing the fire receiver.
According to the fire detector according to the present invention, when the malfunction of its own detector is detected, the switch of the disconnection circuit interposed in the line is opened, so even if it is not a dedicated fire receiver, the fire receiver Without renewal, it is possible to notify the malfunction of the fire detector with the existing fire receiver.

It is a schematic block diagram of the fire alarm facility according to the present invention. It is an example of the structure of the control circuit of the fire detector provided with the disconnection circuit shown in FIG. It is a terminal and wiring example of a fire detector according to Embodiment 1 of the present invention. It is a terminal and wiring example of the fire detector which concerns on Embodiment 2 of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
FIG. 1 is a schematic configuration diagram of a fire alarm facility 100 according to Embodiment 1 of the present invention. In FIG. 1, the case where the three fire detectors 2 are provided and the termination resistance R as a termination element is provided is illustrated as an example. Here, the number of fire detectors 2 is not limited thereto.

  The fire alarm system 100 includes a fire detector 2 installed in each room of a building such as a building, and a fire receiver 1 that gives an alarm based on a detection result of the fire detector 2, and a common line 3 and a line line 4 are connected by a sensor line 5 composed of 4. Hereinafter, the common line 3 and the line line 4 may be collectively referred to as a sensor line 5.

[Configuration of Fire Alarm Equipment 100]
The fire alarm facility 100 will be described with reference to FIG.

  The fire receiver 1 is a P-type receiver, and is connected to one or more fire detectors 2 via a common line 3 and a line line 4. The P-type fire receiver is an electrical device such as a voltage of the sensor line 5 that is generated when the electrical contact of the fire sensor 2 connected to the sensor line 5 including the common line 3 and the line line 4 is closed. The fire is judged based on the change. The fire receiver 1 is provided with a speaker for notifying a fire by voice, a lamp for notifying by a display, and the like. Further, the fire receiver 1 is provided with a disconnection alarm generating means for notifying that a disconnection alarm is generated by voice or a lamp even when the sensor line 5 is disconnected. The fire receiver 1 is provided in a central management room such as a building disaster prevention center. And the fire and disconnection which the fire receiver 1 detected are alert | reported in a disaster prevention center.

  When the fire detector 2 detects heat, smoke, flame, etc. generated by the flame, the fire detector 2 outputs a fire signal, which is a signal indicating that a fire has been detected, to the fire receiver 1 via the sensor line 5. The fire signal of the fire detector 2 is, for example, a signal that reduces the impedance of the sensor line 5 by the switching operation of the fire detector 2. The fire detector 2 detects its own malfunction such as an output value abnormality by the output value monitoring method. In addition, the output value monitoring method is how much the output value when the fire detector 2 does not detect a fire changes with respect to the output value when the fire detector 2 is initially installed. This is a method of detecting and detecting a malfunction of the fire detector 2. The fire detector 2 is connected to the fire receiver 1 via a sensor line 5 so as to be connected in parallel by a so-called feed wiring system.

  The terminating resistor R is located at the end of the sensor line 5 connected by a so-called feed wiring system, and is a resistor that connects the common line 3 and the line line 4. The fire receiver 1 monitors the disconnection of the sensor line 5 by a weak current flowing through the sensor line 5 by the terminating resistor R.

  The sensor line 5 is composed of a common line 3 and a line line 4, and connects the fire receiver 1 and the fire detector 2. The fire detectors 2 are connected to the common line 3 and the line 4 so as to have a parallel connection relationship by a so-called feed wiring system. The common line 3 and the line line 4 constitute one line as a set. That is, for example, if the common line 3 is shared from the fire receiver 1 and a plurality of line lines 4 are drawn out to form a plurality of lines, a fire signal can be received for each line.

[Composition of fire detector 2]
FIG. 2 shows an example of the configuration of the control circuit 50 of the fire detector 2. The configuration of the control circuit 50 of the fire detector 2 will be described with reference to FIG.

  The control circuit 50 of the fire detector 2 has a detection circuit 14 and a discrimination circuit 13, has an inspection means for detecting its own defect by self-inspection, and a disconnect circuit 15, and based on the result of the inspection means, A disconnection generating means for disconnecting the sensor line 5 when the fire sensor 2 itself is defective is provided. Further, there are a constant voltage circuit 11 that supplies a constant voltage to a necessary circuit, a switching circuit 12 that connects the common line 3 and the line line 4 to bring the sensor line 5 into a low impedance state, and that there is a problem with the external. It further has an operation indicator lamp 17 which is a display means for displaying and identifying.

The constant voltage circuit 11 converts the power supply voltage supplied from the fire receiver 1 via the sensor line 5 into a predetermined voltage value, for example, 5 (V), and supplies it. As shown in FIG. 2, the constant voltage circuit 11 is connected to the determination circuit 13 and the detection circuit 14 and supplies an operating voltage thereto. The constant voltage circuit 11 is composed of, for example, a constant voltage IC.
The detection circuit 14 detects heat, smoke, flame, and the like generated by a fire and outputs a detection result. It consists of elements necessary for detection, an amplifier circuit, and the like. The detection circuit 14 is connected to the determination circuit 13.

  The determination circuit 13 is connected to the detection circuit 14, the switching circuit 12, the operation indicator lamp 17, and the switching circuit 15.

  The determination circuit 13 determines the level of the output of the detection circuit 14 to determine whether or not there is a fire, and based on the determination result, the switching circuit outputs a fire signal to the fire receiver 1. 12 is controlled. The determination circuit 13 controls the operation indicator lamp 17 to be lit when it is determined that there is a fire.

Further, the discrimination circuit 13 detects a malfunction of the fire detector 2 by the output value monitoring method, and outputs a separation signal and outputs a separation signal 15 when it is determined that the output value is abnormal as a result of detection by the detection circuit 14. Is to control. In addition, the method in which the detection circuit 14 detects the malfunction of the fire detector 2 may be a method in which heat or light is simulated by itself as a pseudo output method.
In other words, the discrimination circuit 13 receives the detection output from the detection circuit 14 and discriminates the fire and the malfunction of the fire detector 2 itself by level judgment or the like. The discriminating circuit 13 is composed of, for example, a microprocessor.

  The switching circuit 12 is in a closed state when the determination circuit 13 determines that there is a fire, and outputs a fire signal to the fire receiver 1. That is, if the discrimination circuit 13 discriminates that there is a fire, it outputs a signal indicating that the switching circuit 12 is closed, and the switching circuit 12 receiving the output maintains the sensor line 5 in a low impedance state. The fact that the switching circuit 12 maintains the sensor line 5 in a low impedance state is a fire signal from the fire sensor 2 to the fire receiver 1. Low impedance means that the impedance is lower than the impedance of the sensor line 5 in a state where no fire has occurred. The switching circuit 12 is connected to the discrimination circuit 13 and the sensor line 5. Note that the switching circuit 12 is configured by, for example, a transistor.

The disconnect circuit 15 has a switch interposed in the line 4 of the sensor line 5, and the switch is closed during normal times (when monitoring a fire).
The disconnection circuit 15 opens the disconnection circuit 15 based on the output of the disconnection signal from the determination circuit 13 when the determination circuit 13 determines that the fire detector 2 itself is defective. That is, if the fire detector 2 itself has a problem, the switch of the disconnect circuit 15 interposed in the line 4 is opened, and the sensor line 5 is disconnected.

  The operation indicator lamp 17 is controlled to be turned on or blinked based on the output of the determination circuit 13 in the event of a fire or when the fire detector 2 itself is defective. The operation indicator lamp 17 is connected to the determination circuit 13 and the line line 4. The operation indicator lamp 17 may be a light emitting element such as an LED.

[Wiring method of sensor wiring 5]
The wiring system of the sensor wiring 5 and the fire sensor 2 will be described with reference to FIGS.

  The fire detector 2 includes a base 40 and a main body 30, and is installed with the main body 30 attached to the base 40. The base 40 has a common line terminal 20 and a line line terminal 22, and the main body 30 has a terminal X2. The common line terminal 20 includes a common line in-side terminal 3A and a common line out-side terminal 3B. The line line terminal 22 includes a line line in-side terminal 4A and a line line out-side terminal 4B.

  As for the common wire 3, the lead-in side is connected to the common wire in-side terminal 3A, the lead-out side is connected to the common wire out-side terminal 3B, and the common wire terminal 20 performs feed wiring as before. That is, the common line in-side terminal 3A is connected to the common line 3 drawn out from the common line out-side terminal 3B of the preceding fire detector 2, and the common line 3 drawn out from the common line out-side terminal 3B is connected to the subsequent stage fire detection. Is connected to the common line in-side terminal 3A of the device 2.

  On the other hand, the line line 4 connects the lead-in side to the line-line-in side terminal 4A, but does not connect the lead-out side to the line-line out side terminal 4B. The lead-out side of the line 4 is connected to a terminal X2 provided on the back surface of the main body 30. That is, the line line IN side terminal 4A is connected to the line line 4 drawn from the terminal X2 of the preceding fire detector 2, and the line line 4 drawn from the terminal X2 is the line line IN side terminal of the subsequent fire sensor 2. Connected to 4A.

  Thereby, the electrical connection state of the line line 4 is connected from the line line 4 on the drawing side to the disconnection circuit 15 via the fitting line provided on the line-line-in side terminal 4A and the main body 30. Further, the line 15 is connected from the disconnection circuit 15 through the terminal X2 provided on the main body 30 to the line line 4 on the lead-out side. Since such a connection is made, the sensor circuit 5 is switched between a normal state and a disconnected state by opening and closing the disconnection circuit 15.

[Description of operation]
With reference to FIG.1 and FIG.2, the operation example of the fire alerting | reporting equipment 100 when there exists a malfunction in the fire detector 2 is demonstrated.

  Each fire detector 2 performs fire discrimination at predetermined intervals during fire monitoring. At the time of this fire monitoring, each fire detector 2 also determines whether or not it has a defect by the output value monitoring method.

  First, when there is a malfunction in the output value abnormality of each fire detector 2, the discrimination circuit 13 of the control circuit 50 of the fire detector 2 turns on or blinks the operation indicator lamp 17. The operation indicator lamp 17 is lit or blinked to notify the user which fire detector 2 has a defect in appearance. Further, the determination circuit 13 outputs a separation signal to the separation circuit 15 at the same time as the lighting or blinking control of the operation indicator lamp 17. The disconnection circuit 15 to which the disconnection signal is input opens the switch of the disconnection circuit 15 and disconnects the sensor line 5.

  Next, when the fire receiver 1 detects the disconnection of the sensor line 5, a disconnection alarm is given by a disconnection display on the panel surface and a disconnection alarm by sound as a disconnection alarm issuing means of the fire receiver 1. At this time, the user uses the disconnection alarm issuing means of the fire receiver 1 so that the sensor line 5 is really disconnected or there is a malfunction in either the fire sensor 2 connected to the sensor line 5. I can know that. In addition, the user who confirmed the disconnection alarm reporting means by intermittently disconnecting the switch of the disconnection circuit 15 when the fire detector 2 is defective, that is, by continuously opening and closing the disconnection circuit 15 On the other hand, it is possible to notify that the failure of the fire sensor 2 connected to the sensor line 5 is not a disconnection of the sensor line 5.

  Finally, the fire detector 2 that has disconnected the sensor line 5 stops the output of the disconnect signal after the disconnection signal output time exceeds the time that the fire receiver 1 can detect disconnection, The disconnection circuit 15 is restored to the normal connection state, and the sensor line 5 is restored as usual. For example, if the fire receiver 1 can detect a disconnection within 5 seconds after the sensor line 5 is disconnected, the discrimination circuit 13 of the fire detector 2 is 10 seconds after the switch of the disconnect circuit 15 is disconnected. The disconnection circuit 15 may be restored. At this time, the fire receiver 1 holds the disconnection display. With this operation, the fire alarm system 100 can detect a fire even after the operation of detecting the malfunction of the fire detector 2. That is, even if the sensor line 5 is disconnected due to a malfunction of the fire sensor 2, the disconnection circuit 15 is restored after the fire receiver 1 detects the disconnection, so that the sensor line 5 returns as usual. Therefore, when a fire is detected, the fire detector 2 can output a fire signal to the fire receiver 1 via the sensor line 5. And the fire receiver 1 can alert | report a fire by the audio | voice from a speaker or blink of a lamp | ramp based on the output fire signal.

  In addition, after the sensor line 5 is restored, the operation indicator lamp 17 of the fire detector 2 is preferably kept lit or flashing when there is a malfunction. This holding is preferably continued until the user operates an acoustic stop switch or the like.

  In the above description of the operation, the case of the fire receiver 1 that can maintain the disconnection display even when the sensor line 5 is restored has been described. However, there is also a fire receiver 1 that is restored when the sensor line 5 is restored. When the disconnection signal 15 is restored to the normal connection after the fire receiver 1 has exceeded the time that the fire receiver 1 can detect the disconnection as described above, the fire receiver 1 The receiver 1 cannot report the disconnection. In the case of such a fire receiver 1, the switch of the disconnection circuit 15 is intermittently disconnected. While the disconnection circuit 15 is in a normal connection state, the fire receiver 1 does not issue a disconnection alarm and performs fire monitoring. While the switch of the disconnection circuit 15 is disconnected, a disconnection alarm sounds from the fire receiver 1. By intermittently sounding the disconnection alarm, the user can know that the fire detector 2 is defective. The intermittent disconnection of the switch of the disconnecting circuit 15 is preferably continued until the user notices the sound of the fire receiver 1 and operates the acoustic stop switch or the like.

[Effects of the fire alarm system 100]
The fire alarm system 100 according to the first embodiment controls the disconnection circuit 15 having a switch interposed in the line line 4 when each fire detector 2 detects its own malfunction, Disconnect. Thereby, even if it is a P-type fire receiver 1, the disconnection of the sensor circuit | line 5 can be detected as an abnormal signal of the fire sensor 2, and the malfunction of the fire sensor 2 can be known. That is, the fire alarm system 100 according to the first embodiment notifies the malfunction of the fire detector 2 even in the fire receiver 1 that is not a dedicated fire receiver that can receive and control the result of the self-inspection of the fire detector 2. can do.

  The fire alarm system 100 according to the first embodiment is effective, for example, when renewing a P-type fire alarm system already installed in a building. That is, the fire detector of the P-type fire alarm system already installed in the building is the fire detector 2, and the line wire 4 is drawn into the line wire-in side terminal 4A and connected so as to be drawn out from the terminal X2. The fire alarm facility 100 can be obtained. Rather than using a dedicated fire receiver (for example, R type) as the fire receiver 1 of the P-type fire alarm facility already installed in the building, the existing fire detector is the fire detector 2 of the present invention. Can be implemented at low cost.

Embodiment 2. FIG.
FIG. 4 is a terminal and wiring diagram of the fire detector according to the second embodiment of the present invention. In the second embodiment, differences from the first embodiment will be described in detail, and members corresponding to the first embodiment are denoted by the same reference numerals and description thereof is omitted. Furthermore, since the configuration of the fire alarm system 100, the configuration of the fire detector 2, and the operation description are the same as those of the first embodiment, the description thereof will be omitted.

[Wiring method of sensor wiring 5]
The fire detector 2 includes a base 40 and a main body 30, and is installed with the main body 30 attached to the base 40. The base 40 includes a common line terminal 20, a line line terminal 22, a terminal X1, and a terminal X2. The common line terminal 20 includes a common line in-side terminal 3A and a common line out-side terminal 3B. The line line terminal 22 includes a line line in-side terminal 4A and a line line out-side terminal 4B.

  As for the common wire 3, the lead-in side is connected to the common wire in-side terminal 3A, the lead-out side is connected to the common wire out-side terminal 3B, and the common wire terminal 20 performs feed wiring as before. On the other hand, the line line 4 is connected to the line line-in side terminal 4A at the lead-in side, but is not connected to the line-line out side terminal 4B but is connected to the terminal X2.

  Thereby, the electrical connection state of the line line 4 is connected from the line line 4 on the drawing side to the disconnection circuit 15 via the fitting line provided on the line-line-in side terminal 4A and the main body 30. Furthermore, the line 4 connected to the terminal X2 of the base 40 is drawn out from the disconnection circuit 15 through the fitting fitting of the terminal X2 provided on the main body 30. Since such a connection is made, the sensor circuit 5 is switched between a normal state and a disconnected state by opening and closing the disconnection circuit 15.

[Effects of the fire alarm system 100]
The fire alarm system 100 according to the second embodiment controls the disconnection circuit 15 having a switch interposed in the line line 4 when each fire detector 2 detects its own malfunction, Disconnect. Thereby, even if it is a P-type fire receiver 1, the disconnection of the sensor circuit | line 5 can be detected as an abnormal signal of the fire sensor 2, and the malfunction of the fire sensor 2 can be known. That is, the fire alarm system 100 according to the first embodiment notifies the malfunction of the fire detector 2 even in the fire receiver 1 that is not a dedicated fire receiver that can receive and control the result of the self-inspection of the fire detector 2. can do.

  The fire alarm system 100 according to the second embodiment is effective when, for example, renewing a P-type fire alarm system already provided in a building. That is, the fire detector of the P-type fire alarm system already installed in the building is the fire detector 2, and the line wire 4 is drawn into the line wire-in side terminal 4A and connected so as to be drawn out from the terminal X2. The fire alarm facility 100 can be obtained. It is cheaper to use an existing fire detector as a fire detector 2 than to use a dedicated fire receiver (for example, R type) as a fire receiver 1 for a P-type fire alarm system already installed in a building. Can be implemented.

1 Fire receiver, 2 Fire detector, 3 Common line, 3A Common line in side terminal, 3B Common line out side terminal, 4 Line line, 4A Line line in side terminal, 4B Line line out side terminal, 5 Sensor line , 11 Constant voltage circuit, 12 Switching circuit, 13 Discriminating circuit, 14 Detection circuit, 15 Disconnect circuit, 17 Operation indicator, 20 Common line terminal, 22 Line line terminal, 30 Body, 40 Base, 50 Control circuit, 100 Fire alarm equipment, R terminal resistance, X1, X2 terminals.

Claims (5)

In a fire alarm system comprising: a sensor line connected to a fire receiver; and one or a plurality of fire detectors connected to the sensor line and outputting a fire signal to the sensor line by a switching operation;
The fire detector includes an inspection means for detecting a self-failure by self-inspection, and a disconnection generating means for disconnecting the sensor line in the case of a failure based on a result of the inspection means,
The fire alarm equipment comprising a disconnection alarm notification means for issuing a disconnection alarm when the sensor line is disconnected. The disconnection generating means comprises a disconnect circuit having a switch interposed in the line of the sensor line,
Normally, the switch of the disconnect circuit is closed and the line line is connected.
2. The fire alarm system according to claim 1, wherein when the malfunction of the inspection means is detected, a switch of the disconnection circuit is opened to disconnect the line line.   The fire alarm system according to claim 1 or 2, wherein the fire detector includes display means for displaying and identifying that there is a defect on the outside based on a result of the inspection means. The disconnection generating means, according to claim 2 Symbol placement of fire alarm system, characterized in that disconnecting the switch of the disconnection circuit intermittently. In a fire detector that is connected to a fire receiver via a sensor line and outputs a fire signal to the sensor line by a switching operation,
Inspection means for detecting self-failure by self-inspection;
Based on the result of the checking means, a judging means for outputting a separation signal in the case of a malfunction;
A disconnection circuit comprising a disconnection circuit having a switch interposed in a line of the sensor line, the disconnection generating means for opening the switch of the disconnection circuit and disconnecting the sensor line when receiving the disconnection signal; Fire detector characterized by that.